Coordination (Ionization) Isomers

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The compounds [Cr(NH3)5(SO4)]Br and [Cr(NH3)5Br]SO4 are examples of coordination isomers. Carefully examine the structures shown below. In this pair of examples, the counter-ions are included in the display. The positions of the counter-ions are fixed relative to the complexes in these displays, but in solution the complex ion and counter-ion move independently of each other.

1. What is the difference between the two coordination isomers?
2. Formulate a definition for the term "coordination isomers".
3. Coordination isomers are sometimes called ionization isomers. Why is ionization isomer a sensible name for this type of isomerization?
 pentaamminesulfatochromium(III) bromide pentaamminebromochromium(III) sulfate

18:31, 1 Oct 2013

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